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SAE-AISI A7 Steel vs. SAE-AISI M4 Steel

Both SAE-AISI A7 steel and SAE-AISI M4 steel are iron alloys. They have a moderately high 91% of their average alloy composition in common.

For each property being compared, the top bar is SAE-AISI A7 steel and the bottom bar is SAE-AISI M4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
76
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
770 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 260
260
Melting Completion (Liquidus), °C 1470
1610
Melting Onset (Solidus), °C 1430
1560
Specific Heat Capacity, J/kg-K 470
440
Thermal Conductivity, W/m-K 37
25
Thermal Expansion, µm/m-K 12
12

Otherwise Unclassified Properties

Base Metal Price, % relative 10
25
Density, g/cm3 7.7
8.3
Embodied Carbon, kg CO2/kg material 13
14
Embodied Energy, MJ/kg 200
210
Embodied Water, L/kg 100
110

Common Calculations

PREN (Pitting Resistance) 11
30
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
23
Strength to Weight: Axial, points 29 to 77
26 to 72
Strength to Weight: Bending, points 25 to 48
23 to 45
Thermal Diffusivity, mm2/s 10
6.9
Thermal Shock Resistance, points 27 to 72
24 to 68

Alloy Composition

Carbon (C), % 2.0 to 2.9
1.3 to 1.4
Chromium (Cr), % 5.0 to 5.8
3.8 to 4.8
Copper (Cu), % 0 to 0.25
0 to 0.25
Iron (Fe), % 81.4 to 87.7
75.9 to 81.4
Manganese (Mn), % 0 to 0.8
0.15 to 0.4
Molybdenum (Mo), % 0.9 to 1.4
4.3 to 5.5
Nickel (Ni), % 0 to 0.3
0 to 0.3
Phosphorus (P), % 0 to 0.030
0 to 0.030
Silicon (Si), % 0 to 0.5
0.2 to 0.45
Sulfur (S), % 0 to 0.030
0 to 0.030
Tungsten (W), % 0.5 to 1.5
5.3 to 6.5
Vanadium (V), % 3.9 to 5.2
3.8 to 4.5

Comparable Variants